Tailscale tries a few things, from direct connection, to NAT traversal techniques, and as a last resort, relay servers run by Tailscale that both nodes can conn

Tailscale tries a few things, from direct connection, to NAT traversal techniques, and as a last resort, relay servers run by Tailscale that both nodes can connect out to. The “magic” is just that it’s all automatic works pretty much no matter what.